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Séminaire de EDP - Physique Mathématique

Microlocal scattering matrix for a coupled Schroedinger operator and application to the semiclassical resonances

Setsuro Fujiie

( Kyoto )

Salle de Conférences

le 08 avril 2025 à 11:00

We consider a 2 by 2 matrix-valued operator with two 1D Schroedinger operators on the diagonals and small in h interactions on the off-diagonals. We compute the semiclassical connection formula of the microlocal solutions (microlocal scattering matrix) at a crossing point of the two characteristic sets, and apply it to the resonance asymptotics. We will see that the subprincipal term of the microlocal scattering matrix is reduced toan osillatory integral whose critical point is the crossing point.